Create circular loop antenna
loopCircular object is a planar circular loop antenna
on the X-Y plane.
The thickness of the loop is related to the diameter of an equivalent cylinder loop by the equation
d is the diameter of equivalent cylindrical loop
r is the radius of equivalent cylindrical loop
For a given cylinder radius, use the
cylinder2strip utility function to calculate the equivalent width. The
default circular loop antenna is fed at the positive X-axis. The point of the X-axis is
at the midpoint of the inner and outer radii.
creates a one
wavelength circular loop antenna in the X-Y plane. By default, the
circumference is chosen for the operating frequency 75 MHz.
lc = loopCircular
creates a one wavelength circular loop antenna, with additional properties
specified by one, or more name-value pair arguments.
lc = loopCircular(Name,Value)
is the property name and
Value is the corresponding
value. You can specify several name-value pair arguments in any order as
ValueN. Properties not specified retain their default
Radius— Outer radius of loop
Outer radius of loop, specified as a scalar in meters.
Thickness— Thickness of loop
Thickness of loop, specified as a scalar in meters.
Load— Lumped elements
Lumped elements added to the antenna feed, specified as a lumped element
object handle. For more information, see
lumpedelement is the object handle for the load
Tilt— Tilt angle of antenna
0(default) | scalar | vector
Tilt angle of the antenna, specified as a scalar or vector with each element unit in degrees. For more information, see Rotate Antennas and Arrays.
'TiltAxis',[0 1 0;0 1 1]
tilts the antenna at 90 degree about two axes, defined by vectors.
TiltAxis— Tilt axis of antenna
[1 0 0](default) | three-element vector of Cartesian coordinates | two three-element vectors of Cartesian coordinates |
Tilt axis of the antenna, specified as:
Three-element vectors of Cartesian coordinates in meters. In this case, each vector starts at the origin and lies along the specified points on the X-, Y-, and Z-axes.
Two points in space, each specified as three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points in space.
A string input describing simple rotations around one of the principal axes, 'X', 'Y', or 'Z'.
For more information, see Rotate Antennas and Arrays.
'TiltAxis',[0 1 0]
'TiltAxis',[0 0 0;0 1 0]
ant.TiltAxis = 'Z'
|Display antenna or array structure; Display shape as filled patch|
|Display information about antenna or array|
|Axial ratio of antenna|
|Beamwidth of antenna|
|Charge distribution on metal or dielectric antenna or array surface|
|Current distribution on metal or dielectric antenna or array surface|
|Design prototype antenna or arrays for resonance at specified frequency|
|Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays|
|Input impedance of antenna; scan impedance of array|
|Mesh properties of metal or dielectric antenna or array structure|
|Change mesh mode of antenna structure|
|Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array|
|Azimuth pattern of antenna or array|
|Elevation pattern of antenna or array|
|Return loss of antenna; scan return loss of array|
|Voltage standing wave ratio of antenna|
Create and view a circular loop with 0.65 m radius and 0.01 m thickness.
c = loopCircular('Radius',0.64,'Thickness',0.03); show(c)
Calculate the impedance of a circular loop antenna over a frequency range of 70MHz-90MHz.
c = loopCircular('Radius',0.64,'Thickness',0.03); impedance(c,linspace(70e6,90e6,31))
 Balanis, C.A. Antenna Theory. Analysis and Design, 3rd Ed. New York: Wiley, 2005.